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Finding the Fourth Proportional to 671.44, 1,005.09 and 427.60

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Solution

The fourth proportional to 671.44, 1,005.09 and 427.60 is: 640.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.44 : 1,005.09 = 427.60 : x
  2. Step 2: Convert to fraction form
    671.44/1,005.09 = 427.60/x
  3. Step 3: Cross multiply
    671.44x = 1,005.09 × 427.60
  4. Step 4: Simplify right side
    671.44x = 429,776.48
  5. Step 5: Solve for x
    x = 429,776.48/671.44
  6. Step 6: Final answer
    x = 640.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.